Chrome gives you some idea of the permissions an extension requires when you install it, so you can see if the extension is only operating on a single website or has additional permissions. Firefox doesn’t have a fine-grained permissions system, so extensions have access to the entire browser — and more. Internet Explorer has limited support for add-ons.
Browser plug-ins are a separate type of module. The main difference is that extensions are usually just source code, but plug-ins are always executables (i.e. object code). As of 2019, plug-ins have been deprecated by most browsers, while extensions are widely used. The most popular browser, Google Chrome, has thousands of extensions available but only one plug-in: the Adobe Flash Player that is disabled by default.
Plug-ins are used to handle media types for which the application does not have built-in capability. They are third-party executables that interface via NPAPI. But plug-ins are now deprecated, due to security concerns and improvements in Web APIs.[11] The only plug-in still officially supported by Firefox is the Adobe Flash Player,[7] which Adobe will cease to update in 2020.[12]
Because of Chrome's success, Microsoft created a very similar extension API for its Edge browser, with the goal of making it easy for Chrome extension developers to port their work to Edge.[11] But after three years Edge still had a disappointingly small market share, so in December 2018 Microsoft announced that Edge is being rebuilt as a Chromium-based browser.[12][13] (Chromium is Google's open-source project that serves as the functional core of Chrome and many other browsers.) This remade Edge should have the same API as Chrome, which will enable users to install extensions directly from the Chrome Web Store.[13][14]

Browser plug-ins are a separate type of module. The main difference is that extensions are usually just source code, but plug-ins are always executables (i.e. object code). As of 2019, plug-ins have been deprecated by most browsers, while extensions are widely used. The most popular browser, Google Chrome, has thousands of extensions available but only one plug-in: the Adobe Flash Player that is disabled by default.
Some Google Chrome extension developers have sold their extensions to third-parties who then incorporated adware.[27][28] In 2014, Google removed two such extensions from the Chrome Web Store after many users complained about unwanted pop-up ads.[29] The following year, Google acknowledged that about five percent of visits to its own websites had been altered by extensions with adware.[30][31][32]

Mozilla Firefox Add-ons are neatly arranged. You can browse through Featured, Most Popular, and Top Rated add-ons. But the best way is to drill down the categories given in the sidebar. You can use the search bar too. Here are the simple steps after you locate the add-on you want to install. Let’s download and install the very popular ReminderFox add-on which helps you with productivity.
Chrome gives you some idea of the permissions an extension requires when you install it, so you can see if the extension is only operating on a single website or has additional permissions. Firefox doesn’t have a fine-grained permissions system, so extensions have access to the entire browser — and more. Internet Explorer has limited support for add-ons.

You should be particularly careful with browser extensions. They’re running in your browser, so a bad extension could use its access to snoop on your browsing, possibly capturing your credit card numbers and passwords. However, while it’s good to bear this in mind, the actual risks — assuming you stick with extensions from well-known developers and well-reviewed extensions with lots of users — are fairly minimal.
Extension has moved to official site A bookmarks and bookmarklets manager for having them under a single icon, also add tools-bar for functionalities (scroll, goto top, goto bottom). Fully customizable extension with themes and options. Ctrl+Click or MiddleClick opens links in a new background tab. Click on arrow opens all links of the folder. Options page let you add up to 27 selected bookmarklets to install (see Extension Details), edit bookmarks/bookmarklets, and also add your own custom search engines.
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